From the Super Mario Wiki
Simian Spring (Leapus Largium) is Diddy Kong's special pad ability in the game Donkey Kong 64. Diddy learns this ability when he buys a potion from Cranky Kong at his lab in Frantic Factory. When Diddy stands on a pad with his face on it, the player can press the button to make him perform a high jump by springing off of the ground with his tail, which allows him to access areas that are difficult to reach. The potion that unlocks this move costs seven Banana Bunch Coins, and it is the last potion to be received by Cranky. The scientific name of this ability is Leapus Largium, a play on the words "Leap" and "Large".
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